import static java.lang.Thread.sleep;

public class Demo3 {
    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread() {
            public void run() {
                while (true) {
                      System.out.println("Thread");
                      try {
                          sleep(1000);
                      } catch (InterruptedException e) {
                          throw new RuntimeException(e);
                      }
              }
          }
        };
        thread.start();

        while (true) {
            System.out.println("main");
            sleep(1000);
        }
    }
}
